1 Answer
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To fly a 60-degree bank coordinated turn with 1 G on the aircraft, you'll be dropping like a rock.

But your stall speed with 1 G on the aircraft is what it is, regardless of how you obtain that 1 G -- straight & level, or coordinated turn with deceleration down to reduce the G loading, or inverted & pulling 1 G... the angle of attack that stalls your wing will be reached at the same speed in all of those cases.

$\begingroup$That aircraft is accelerating at 50% rate compared to the rock, because the fraction of the lift that remains to counter gravity is cos 60° = 1/2. Otherwise fully agree!$\endgroup$
– boglApr 5 at 9:22